One user randomly loses LAN connection

We have one user who loses their LAN connection at random intervals. Her computer is running XP Pro and she is connecting to a Small Business 2003 server.
When she loses her LAN connection she is unable to access any shared drives on the server, but her workstation can still ping the server fine. She can also still access the Internet fine. If I do an ipconfig /release, /renew on her computer when she loses the connection, her connection to the server is reestablished and she can access everything. I tried increasing the DHCP lease duration, but it didn't change anything, she has the same problem.

May be another same IP used at this time (because you say ipconfig /release, /renew works), are you sure all IPs from DHCP ? If you use static IP and DHCP in your network, some IP conflicts will be occur. If so you must use only static IP or DHCP in your network.

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